CVE-2021-1434 : Exploit Details and Defense Strategies

A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to overwrite arbitrary files in the underlying file system. This article provides an overview of CVE-2021-1434 and its impact along with technical details and mitigation steps.

Understanding CVE-2021-1434

This section delves into the specifics of the vulnerability and its potential consequences.

What is CVE-2021-1434?

The vulnerability in the CLI of Cisco IOS XE SD-WAN Software allows a local attacker to overwrite files on the file system due to insufficient validation of specific CLI command parameters.

The Impact of CVE-2021-1434

Exploitation of this vulnerability could result in an attacker being able to overwrite the content of any file on the underlying host file system.

Technical Details of CVE-2021-1434

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from a lack of validation of CLI command parameters, enabling attackers to overwrite files in the file system.

Affected Systems and Versions

The vulnerability affects Cisco IOS XE Software with specific parameters in the CLI command.

Exploitation Mechanism

Attackers, with high privileges, can exploit the vulnerability by issuing a specific CLI command with parameters to overwrite files.

Mitigation and Prevention

Discover the steps to secure your system against CVE-2021-1434.

Immediate Steps to Take

Refrain from using the specific vulnerable CLI command to mitigate immediate risks.

Long-Term Security Practices

Implement rigorous access controls and validation mechanisms to prevent unauthorized access and file overwriting.

Patching and Updates

Ensure timely patching and software updates from Cisco to address this vulnerability.